build(deps): bump Azure.Identity from 1.4.0 to 1.4.1 (#215)

Bumps [Azure.Identity](https://github.com/Azure/azure-sdk-for-net) from 1.4.0 to 1.4.1.
- [Release notes](https://github.com/Azure/azure-sdk-for-net/releases)
- [Commits](Azure/azure-sdk-for-net@Azure.Identity_1.4.0...Azure.Identity_1.4.1)

---
updated-dependencies:
- dependency-name: Azure.Identity
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/LettuceEncrypt.Azure/LettuceEncrypt.Azure.csproj

@@ -17,7 +17,7 @@ See https://nuget.org/packages/LettuceEncrypt for more details.
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Azure.Identity" Version="1.4.0" />
+    <PackageReference Include="Azure.Identity" Version="1.4.1" />
     <PackageReference Include="Azure.Security.KeyVault.Certificates" Version="4.2.0" />
     <PackageReference Include="Azure.Security.KeyVault.Secrets" Version="4.2.0" />
   </ItemGroup>